1. Heat a non stick pan over med. high heat.
2. Season breast with seasoning salt, and cook until done through.
3. Meanwhile brush oil on 1 side of each slice of bread.
4. Remove chicken from pan reduce heat to med. and place 1 slice of bread oil side down in the pan.
5. Top with crumbled feta, sliced avocado and Tomato, then chicken and lettuce.
6. Spread dijon on the bare side of the 2nd slice of bread and place oil side up.
7. Grill until golden brown and then CAREFULLY flip the sandwich over and toast the other side.
8. Serve warm.